Mario De Caro is a moral philosopher at the University of Rome and a regular visiting professor at Tufts University. He has written and edited numerous articles and and books on moral philosophy, theory of action, the problem of free will, philosophical naturalism, and the history of science. He advocates for more collaboration between scientists and philosophers. Current problems are unlikely to be solved by specialists in one or the other discipline, he says.

With his Australian colleague David Macarthur, De Caro espouses a broadening of today's "scientific naturalism" - which tends to be an eliminative materialism - to address in a non-reductionist way features like norms, beliefs, and values. They hope to combine the "scientific image" and "manifest image" of Wilfrid Sellars.

What makes Scientific Naturalism and Liberal Naturalism both versions
of naturalism is that neither countenances the supernatural, whether in the
form of entities (such as God, spirits, entelechies, or Cartesian minds), events
(such as miracles or magic), or epistemic faculties (such as mystical insight or
spiritual intuition). The importance of this for the philosophical approach to
normativity is that any form of naturalism will be opposed to Platonism
about norms, where this is understood as the view that normative facts hold
wholly independently of human practices (say, of reason giving) and are, as it
were, simply there anyway waiting to be discovered. For similar reasons it
will be opposed to a Moorean non-naturalism that holds that our access to
normative facts is by way of a sui generis epistemic faculty of intuition
directed at just this kind of fact. And of course it will be opposed to any theistic
foundation for normative facts or our access to them.

(Naturalism and Normativity, Harvard University Press, 2004, p.3)

De Caro has written several articles and a book surveying a "galaxy" of problems surrounding the questions of human action, free will, and moral responsibility. In his 2004 book, Il libero arbitrio, De Caro lists the four historic problems with indeterminism:

The inability to explain agent control (the crux of libertarianism, he says)

De Caro suggests three types of indeterminism - 1) radical indeterminism, 2) causal indeterminism, and 3) the idea of agent causation, for example, that of Roderick Chisholm.

In his discussions of determinism, De Caro describes how compatibilists accept the idea that they have freedom of action as long as they are not being coerced, even if they lack the freedom to choose or "free will." He reviews the Consequence Argument of Peter van Inwagen. And he discusses an attempt by Donald Davidson to reconcile determinism with free will in a physically monistic world by interpreting mental properties as "anomalous."

As is well=known, Davidson argues that mental events are irreducible to physical events. Davidson's "anomaly" is an explicit defense of human freedom and autonomy, says De Caro, which he traces back to an idea of Kant. Davidson's argument for an "anomalous monism "is one of the most complex arguments debated in contemporary analytic philosophy, he says, but it is shown to fail by Jaegwon Kim's arguments against the emergence of a non-reductive physicalism.

Moreover, De Caro says, where Kant was a libertarian, Davidson is a compatibilist, because he defines freedom as the ability to act without hindrance or coercion. In his last years, Willard van Orman Quine accepted Davidson's anomalous monism, says De Caro. Quine was a compatibilist who hoped for as much determinism as quantum physics would allow him, as a principle of reason itself. Most compatibilists agreed with Quine, says De Caro, holding a position called supercompatibilism, in which determinism is not merely compatible with free will, it is a necessary requirement. De Caro cites Moritz Schlick, A. J. Ayer, and quotes R.E. Hobart, who said that determination (not determinism) is required for free will.

[I]ndeterminism by itself—far from automatically generating
freedom—produces only randomness.

However, a different question can also be asked with regard to this issue:
does indeterminism also make freedom impossible, as it is frequently maintained?
Or, to put it differently, can it not be that the addition of some other factors to
indeterminism may make freedom possible, as libertarians (who think that freedom
requires indeterminism) argue?

At this stage, however, one should notice that the above-stated argument
against unreflective libertarianism clearly shows that philosophy, with its conceptual
clarifications and analyses, has an essential role to play in the discussion on free
will. It accomplishes this by determining the correct scope and the conditions of use
of the concepts involved, and by evaluating the relevance of empirical evidence. In
this sense, philosophy’s role is not confined to assessing the relation between
indeterminism and freedom. Another example is the very common view that, if our
actions were determined, ipso facto we would lack freedom.

("How To Deal With The Free Will Issue," in Cartographies of the Mind, Springer, 2007, pp.260-61)

Consistent with his theory of a "liberal naturalism," De Caro promotes the idea of "pluralism,"
in which conceptual analysis and empirical science play complementary roles.

What all this shows is only that science cannot play an exclusive role in the free will
discussion. It does not show that it cannot, and perhaps should not, complement
conceptual analysis. Actually, most of the major views imply that, if free will has to
be real, the natural world has to be structured in an adequate way (a way that each
view describes in its own terms). Certainly, determining the structure of the world is
a task for empirical science. In this sense, according to many, the empirical evidence
mentioned in the previous paragraph is very relevant. This is a methodological stance
I call "pluralism," the view according to which, besides conceptual
analysis, the investigation on free will also requires that empirical research explain
how the natural world actually works.